1.10、部署kube-proxy
- kube-proxy运行在所有node节点上，它监听apiserver中service和endpoint的变化情况，创建路由规则提供服务IP和负载均衡功能
- 这里使用ipvs模式的kube-proxy进行部署，在各个节点需要安装ipset命令，加载ip_vs内核模块
k8s-02:~ # zypper in ipset k8s-02:~ # modprobe ip_vs_rr
1.10.0、创建kube-proxy证书
k8s-01:~ # cd /opt/k8s/ssl/ k8s-01:/opt/k8s/ssl # cat > kube-proxy-csr.json <<EOF { "CN": "system:kube-proxy", "key": { "algo": "rsa", "size": 2048 }, "names": [ { "C": "CN", "ST": "ShangHai", "L": "ShangHai", "O": "k8s", "OU": "bandian" } ] } EOF
1.10.1、生成kube-proxy证书和秘钥
k8s-01:/opt/k8s/ssl # cfssl gencert -ca=/opt/k8s/ssl/ca.pem \ -ca-key=/opt/k8s/ssl/ca-key.pem \ -config=/opt/k8s/ssl/ca-config.json \ -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
1.10.2、创建kube-proxy的kubeconfig文件
k8s-01:/opt/k8s/ssl # source /opt/k8s/bin/k8s-env.sh
"设置集群参数" k8s-01:/opt/k8s/ssl # kubectl config set-cluster kubernetes \ --certificate-authority=/opt/k8s/ssl/ca.pem \ --embed-certs=true \ --server=${KUBE_APISERVER} \ --kubeconfig=kube-proxy.kubeconfig
"设置客户端认证参数" k8s-01:/opt/k8s/ssl # kubectl config set-credentials kube-proxy \ --client-certificate=kube-proxy.pem \ --client-key=kube-proxy-key.pem \ --embed-certs=true \ --kubeconfig=kube-proxy.kubeconfig
"设置上下文参数" k8s-01:/opt/k8s/ssl # kubectl config set-context default \ --cluster=kubernetes \ --user=kube-proxy \ --kubeconfig=kube-proxy.kubeconfig
"设置默认上下文" k8s-01:/opt/k8s/ssl # kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
1.10.3、创建kube-proxy配置文件
k8s-01:~ # cd /opt/k8s/conf/ k8s-01:/opt/k8s/conf # source /opt/k8s/bin/k8s-env.sh k8s-01:/opt/k8s/conf # cat > kube-proxy-config.yaml.template <<EOF apiVersion: kubeproxy.config.k8s.io/v1alpha1 kind: KubeProxyConfiguration clientConnection: burst: 200 kubeconfig: "/etc/kubernetes/cert/kube-proxy.kubeconfig" qps: 100 bindAddress: ##NODE_IP## healthzBindAddress: ##NODE_IP##:10256 metricsBindAddress: ##NODE_IP##:10249 enableProfiling: true clusterCIDR: ${CLUSTER_CIDR} mode: "ipvs" portRange: "" EOF
clientConnection.kubeconfig连接 apiserver 的 kubeconfig 文件clusterCIDRkube-proxy 根据--cluster-cidr判断集群内部和外部流量，指定--cluster-cidr或--masquerade-all选项后 kube-proxy 才会对访问 Service IP 的请求做 SNAT
1.10.4、配置kube-proxy为systemctl启动
k8s-01:~ # cd /opt/k8s/conf/ k8s-01:/opt/k8s/conf # source /opt/k8s/bin/k8s-env.sh k8s-01:/opt/k8s/conf # cat > kube-proxy.service.template <<EOF [Unit] Description=Kubernetes Kube-Proxy Server Documentation=https://github.com/GoogleCloudPlatform/kubernetes After=network.target [Service] WorkingDirectory=${K8S_DIR}/kube-proxy ExecStart=/opt/k8s/bin/kube-proxy \\ --hostname-override=##NODE_IP## \\ --config=/etc/kubernetes/kube-proxy-config.yaml \\ --logtostderr=true \\ --v=2 Restart=on-failure RestartSec=5 LimitNOFILE=65536 [Install] WantedBy=multi-user.target EOF
1.10.5、分发kube-proxy证书和文件到其他节点
#!/usr/bin/env bash source /opt/k8s/bin/k8s-env.sh for (( i=0; i < 5; i++ )) do sed -e "s/##NODE_IP##/${NODE_IPS[i]}/" /opt/k8s/conf/kube-proxy.service.template > \ /opt/k8s/conf/kube-proxy-${NODE_IPS[i]}.service sed -e "s/##NODE_NAME##/${NODE_NAMES[i]}/" -e "s/##NODE_IP##/${NODE_IPS[i]}/" \ /opt/k8s/conf/kube-proxy-config.yaml.template > /opt/k8s/conf/kube-proxy-config-${NODE_IPS[i]}.yaml.template done for host in ${NODE_IPS[@]} do printf "\e[1;34m${host}\e[0m\n" scp /opt/k8s/ssl/kube-proxy.kubeconfig ${host}:/etc/kubernetes/cert scp /opt/k8s/conf/kube-proxy-${host}.service ${host}:/etc/systemd/system/kube-proxy.service scp /opt/k8s/conf/kube-proxy-config-${host}.yaml.template \ ${host}:/etc/kubernetes/kube-proxy-config.yaml scp /opt/k8s/packages/conntrack ${host}:/opt/k8s/bin/ ssh root@${host} "chmod +x /opt/k8s/bin/*" done
kube-proxy 需要 conntrack suse 编译比较麻烦 可以找一个 centos 执行 yum -y install conntrack 从 /usr/sbin 目录下获取 conntrack 二进制文件，复制到 suse 内使用（如果有下载了前面提供的百度云的连接，里面已经包含了conntrack 二进制）
1.10.6、启动kube-proxy服务
#!/usr/bin/env bash source /opt/k8s/bin/k8s-env.sh for host in ${NODE_IPS[@]} do printf "\e[1;34m${host}\e[0m\n" ssh root@${host} "mkdir -p ${K8S_DIR}/kube-proxy" ssh root@${host} "modprobe ip_vs_rr" ssh root@${host} "systemctl daemon-reload && \ systemctl enable kube-proxy --now && \ systemctl status kube-proxy | grep Active" done
1.10.7、查看kube-proxy端口
k8s-01:~ # ss -nltp | grep kube-proxy LISTEN 0 128 192.168.72.25:10249 *:* users:(("kube-proxy",pid=103283,fd=12)) LISTEN 0 128 192.168.72.25:10256 *:* users:(("kube-proxy",pid=103283,fd=13))
